I would highly advise against such a setup, where every app imports the server. Logistically, that is a nightmare due to how aggressive Android is in killing processes. Instead, I'd create a dedicated companion application users can install, and a client SDK with a thin API/protocol for developers to hook into and communicate locally via IPC. The separation is a huge benefit for everybody (especially users) because the less code in that SDK, the more you can huck into the app and manage from 1 place. Security wise, this is beneficial too.